https://cyclingtips.com/2022/03/it-is-time-to-talk-about-tadej-pogacars-tufts/

“At MET we develop and fine tuned every aspects of the Trenta 3K Carbon Mips helmet, from the comfort to the performance. That’s why when Tadej asked us to develop a specific vent system, we jumped on the opportunity. After rigorous CAD modelling, we defined the best vent position and shape while generating no additional drag from ‘the Tadej tuft’, we call this the ‘HAir Vent’. Following further wind tunnel testing, we also discovered that ‘the Tadej tuft’  acted as an air-dam and increased the downforce, which turned out to be very useful on the descent of the Mont Ventoux last year. “
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FROM 124.64.16.*